If you don;t know about it check out
gun.deals they get a lot of deals and sales posted for various gun sites.
Don't be afraid to consider buying online and having it shipped to your local FFL. I've done it several times and never an issue. Around here the FFL transfer fees were around $25 last I did one.
I'm not recomending any of these, but some decent prices and some have free shipping to your local FFL. I wouldn't have a problem ordering from any of these. Probably a bunch more good deals on there, I just stopped scrolling after these.
AND B2-K869-A031 AR15 UTILITY PRO 556 16 30R BLK - Anderson's AM15 BR
gun.deals
Radical Firearms RF-15, 5.56mm, 16
gun.deals
Item Number: 155392 Radical Firearms 16
gun.deals
Item Number: 241633 MPN#: B2-K869-A027 NDR-B2-K869-A027 This
gun.deals
Model MIL-SPORT UPC 810113111940 Item: 810113111940 Explore more ATI
gun.deals
Bud's Gun shop is another place I can recommend. I've ordered through them a few times. Here's what looks like a good deal currently on their front page:
Diamondback Firearms DB15 - $488.21 w/ free shipping
I think Diamondback has a good reputation, this is 16" barrel, has a Magpul stock and grip rather than that cheap "mil-spec" stuff, appears to have a decent full length M-lok handguard, and a lowprofile gasblock instead of the A2 that would need to be replaced. If I were in the market I'd be very tempted.