Las Vegas sets prices for everything based on demand so, if you're in town on the busiest nights of the year, you'll find less of these games available. If you're walking The Strip today, you may see a moving billboard (one of those trucks with a sign) promoting $5 gaming all day, every day at New York-New York. Huzzah!
These aren't always the best odds games you can play and you may end up playing a 6:5 game of blackjack instead of the 3:2 game. 3:2 blackjack pays better when you get blackjack, but the difference is only about 1.5%. If you're buying in for $100, that's $1.50 difference (or about 30% of a hand). It's not optimal, but it may be the only way to get into a $5 blackjack game on The Strip. Even Casino Royale changes their odds on the weekend.
During the week, you'll find a $3 craps game available with 1000x odds where the edge is with the player if you play full odds, but on the weekend, craps games are $5 with "only" 20x odds. That's still the best craps odds on The Strip, but you can see the difference. You'll also be able to find lower minimums on craps, roulette and any "carnival" type games, like 3 card poker, at these casinos.
Casino Royale is still the least expensive casino, overall, on The Strip, but it's not the only place for low rolling gamblers. You can still find low roller options at about half the casinos on The Strip. A good rule of thumb for finding less expensive gaming (and everything) is that the older the casino is the lower the limits will be.