Northern Tool has the Mr. Heater Big Buddy Indoor / Outdoor Propane Heater on sale for $107.99. Use coupon code 255830 for an additional $20 off $100 bringing the price down to $87.99. Standard shipping is $15.99 or free in store pickup if you happen to have a location near you.
This is the larger 18,000 BTU unit that is safe for indoor usage. It's currently $135 on amazon so even with shipping this is a really good price, even more if you can do a local pickup.