I would put chain thrift stores such as Goodwill, lower on your priority list. You can tell that they screen their donations, so the nicer things, including Nerf blasters, aren't sold in stores, but online. This doesn't mean you can't find anything there, but it's much harder to do.
A community rummage/garage/yard sale is going to be your best bet, not just for finding Nerf blasters, but doing so at a cheap price.
When I find Nerf blasters in formal stores, they're almost always at a higher price than at a local yard sale. I recently picked up a stock Demolisher (but no stock) for 50 cents and a Sledgefire for 75 cents (no darts, but had 1 shell). If I found these at a thrift store, they would have been $2-$5 each (still a decent deal, but nowhere near as good as a yardsale deal).
But then there are exceptions to the rule. I got a stock OJ Stryfe for free at a thrift store because it had a faulty jam door switch (it wouldn't work unless you manually opened the jam door and used your finger or pen to actuate the jam door switch.
Yardsales have spoiled me. I won't pay over a dollar for a single blaster, unless it's worth a lot (and I can resell it) or I would otherwise buy it from eBay or NH.
Edited by shandsgator8, 04 June 2017 - 12:01 PM.