You should spend your money a thermostat before a new snake.
And while not ideal at all, but better than unregulated, you could always use a lamp dimmer. I would still recommend a thermostsat asap. And btw, $30 is cheap for a thermostat.
Tarantulas & Other Arachnids
0.2 G. rosea, 0.0.1 P. murinus, 0.0.1 B. sabulosum, 0.0.1 L. difficilis, 0.0.1 A. geniculata
0.0.1 A. versicolor, 0.0.1 L. parahybana, 0.0.1 Hapalopus sp columbia, 0.0.1 B. vagans
0.0.1 Asian Forest Scorpion