Shop around. Some sites are cheaper than others. I love Stoneage Game as a site, but their Everdrive N8 is $150 with cart, label, UGC etc. I paid $124 for mine with cart and label. While not a huge difference, when buying multiple flash carts it can really add up. Also, other sites have more stock. For instance, some of the bigger sites are sold out of N8 right now. The site I got mine from is still well stocked in pretty much everything.
Some examples: SD2NES is $205 with shell and label, Everdrive N64 V2 is $114 with cart and label, etc. Basically take whatever price is listed, and add $15 for cart and label. Shipping (for me) has been
$5 each time. Not sure if it's just because of where I live, or flat rate.
I don't think I can put the site here, so if you want it PM me.
Also, I am in no way affiliated with any site, I just like getting the best deal I can.