Great selection of sports cards boxes and packs. Reasonable pricing on the new stuff and a better selection than most shops that I've been in the area. Lots of odds & ends from the past two or three years for unopened boxes & most shops are only stocking stuff from the past 6 months or so.
Selection of gaming card stuff is extensive -- Lots of booster packs & boxes with tons of single Pokemon, Yugioh & Magic
If your buddy reached behind the counter, I'de think he was stealing too. The only people that belong behind a counter at ANY store are the people who work there. And it does sound like you tried to make a play for a collection that walked into the shop. Store owners pay the rent & should have first rite of refusal. Then and only then should you try to make an offer. I'de ask the owner if it was OK before even trying.