I live in NZ, so Walmart doesn't exist here, but there's still plenty to boycott.
Nestle, obviously. Dick Smith Electronics, a chain store at which I received absolutely appalling service from a really rude manager. Pumpkin Patch... a kids' clothing store. It used to sell clothes that were made in NZ and 100% cotton, but now it's all MIC and synthetic. I can live with synthetic but was pretty disgusted to hear about the MIC thing. It's not terribly logical perhaps, because they do say it right there on the labels - but it seems like they still market themselves as made-in-NZ and everyone I talk to is surprised to hear the clothes aren't local. So it seems sneaky to me.
It's a pesk because the clothes are actually pretty and well made, but I can sometimes get them second-hand.
In fact, I'm more or less boycotting the fashion industry in general. It's not a sacrifice - I never really bought clothes for the fun of it anyway, and I'm just so disillusioned about mass-produced soulless clothes that are badly-made, non-customisable, don't fit and were almost certainly produced in a sweatshop. I'm learning to sew.
And my city's got a few pretty decent second-hand clothing stores now.
I do try to avoid MIC in general, but I'm not terribly consistent about it.
(Example: the "learning to sew to avoid the evil fashion industry" line sounds great, only I bought fabric the other day and noticed halfway through purchasing that it was MIC. Even if I'd noticed earlier, I still would have bought it - not everything can be reconned from vintage thrift store sheets, even if you're into the vintage thrift store sheet look, you know? Anyone know any fabric manufacturers with decent labour practices?)
It would be too strong a word to say I "boycott" diamonds, but I don't buy 'em.
I don't fancy them anyway.
I can't do non-free-range eggs any more.
I have a friend who boycotts halal meat because she says the killing process is more painful.gory/cruel
than the regular bolt-in-the-head method. Anyone know about this? NZ is pretty OK with meat, comparatively - the beef and lamb is all grass-fed and seems pretty contented chewing in the pastures when you drive by - there are still battery farms for chickens, though. I'd have a much harder time eating meat from a grain-fed/Michael Pollan-described environment.