Retail stores: Major retail chains like Walmart, Target, and hobby shops are usually the easiest places to find baseball card packs available for purchase. Around the start of the baseball season in spring, these stores will stock up on the newest series of packs from the current year. You can find everything from basic card packs containing about 10-20 cards selling for $1-5 all the way up to specialized premium packs, boxes, or multi-packs containing hit cards, autographs, or memorabilia selling for $10-100 or more. Grocery stores and drug stores may also carry a small selection of packs oriented towards casual collectors.
Specialty card shops: For a bigger selection beyond the basics, local specialty sports card shops will have the widest variety available from the biggest manufacturers like Topps, Panini, Leaf, etc. These stores cater specifically to collectors and will stock not just packs and boxes but also singles, supplies, magazines and sometimes host trading card events. The selection at a specialty shop goes much deeper than retail with options from past years still available as repack sets or collections in addition to all the latest releases. Product is also organized by sport, player, set and release year for easier browsing.
Online retailers: All the major brick and mortar stores have online presences plus there are numerous dedicated baseball card websites where packs, boxes and collections can be purchased. Some top online retailers for baseball cards include sites operated by the card companies themselves like Topps.com and PaniniCards.com plus sites like SteelCityCollectibles.com, DaCardWorld.com and eBay.com which have massive card catalog inventory available. Buying online often gets you the same pricing as in stores but with a much wider selection, especially for vintage or older out of production cards. Discounts and sales are also frequently run online.
Direct from manufacturers: The primary baseball card producers Topps and Panini offer direct product purchase portals on their websites. This guarantees getting packs and boxes sealed and freshly printed. Topps in particular does limited edition specialty sets available exclusively through topps.com. Going direct cuts out the middleman but often the pricing is comparable to retailer options. Pre-order bonuses and membership perks can make direct purchase worthwhile for avid collectors. Sites like BlowoutCards.com also serve as authorized distributors for certain hard-to-find direct from manufacturer releases.
Card shows/conventions: Serious collectors will want to check local card show event calendars as well as national/regional conventions. These gatherings allow for face-to-face trading and allow access to single sellers and small vendors who carry deeply layered stock sometimes not available in other outlets. Show-exclusive releases and promotions can also make these multi-day extravaganzas fruitful hunting grounds. Larger scale conventions also have manufacturer/corporate booths where collector interactions with the brands are top-notch.
Auctions: Estate sales, online auctions sites like eBay as well as specialized auction houses give access to all manner of sealed and loose baseball cards from firesale bulk lots to rare pre-war tobacco cards. Bidding against other buyers is how full or partial sets, graded gem rookies and unique promotional items change hands. Auctions require more legwork but can yield true collector’s pieces for the right price.
So in summary – between traditional and online retail, specialized hobby shops, direct manufacturers, industry shows and auctions – collectors have many reliable avenues available to seek out and purchase new or vintage baseball card packs, boxes, singles and collections to continuously grow and curate their holdings. Researching the various sources and knowing what each has to offer best serves the avid player collector.