I've never seen Boca burgers at mine in Houston, but they do have Blueberry Hill veggie patties which are vegan and awesome! I just went today and picked up a box of MF sausage patties (and a bag of frozen biscuits to put them on) and a package of 14 veggie patties.
They also had a new thing I'd never seen before: Mrs. May's Naturals
They say they're vegan right on the front of the package. (There are lots of accidentally vegan snacks, but how often do you see them SAY they're vegan?) They come in several flavors, and the ingredients are nuts, rice malt, evaporated cane juice, sea salt. They have a variety pack of cashew, almond, and pumpkin seed. They're nummy.
PS: I also recently saw a new brand of snack mix that piqued my interest: Sahale Snacks
I first saw them at a local natural foods store, and I ordered a box of assorted 2 oz pouches for stocking stuffers, but I also saw them today at Costco in big pouches.
PPS: As far as membership, I don't know whether they do a trial membership or anything like that. I didn't see anything on their website about it. Probably the thing to do is check it out on a friend or relative's membership, or convince your friends or family members that you should all go in together on a membership. You can put multiple people on one membership, get multiple cards, and split the cost.