Gilley's located in Treasure Island is my go to for a country bar in Vegas. It's conveniently located in the heart of the Strip and typically doesn't have a cover till after 10pm. Gilley's has a restaurant where I've eaten one time several years ago. It's BBQ which is pretty standard for a country bar and the food is good for the price. I had the country fried steak for $17 which came with 2 sides and corn bread.
My favorite part about Gilley's isn't the food though... it's the bar. Typically before 10pm there is no cover, and after 10pm the cover is $10 which is pretty cheap by Vegas standards. Get geared up in your cowboy and cowgirl attire and walk on in as there's usually no line. The first thing you'll notice as you walk into the bar is the huge dance floor. Whether you're into swing dancing, 2 step or line dancing, you'll get your fix. The music is almost always country (though some line dance songs aren't country) and sometimes they have excellent musicians that'll play anything you request. If you look past the dance floor, you can't miss the mechanical bull. It's not a rare thing to see girls in bikinis climb on up and go for their 8 second ride. There are contests Thursday's for the guys and Sunday's for the ladies (in bikinis). I believe the payout depends on the amount of contestants and the rides usually cost $10. The actual bar in this place is very long and there's never too much of a wait to order a drink. The one issue you'll find is there may be standing room only if you're looking for a table. The waitresses are showing off their bodies in bikinis and chaps and aren't afraid to hit the dance floor to dance with customers.
Gilley's is a great place to go if you're looking for a bit of country in the heart of the Strip at reasonable prices and great music.