What about Musceltech?
If you're watching your pennies, your best bet is to use Creatine 6000-ES. A 510-gram bottle should run you between 18 and 25 dollars.
CELL-TECH is my personal favorite. A jug of the current version will run you about $60 ($48 if you shop at GNC and have a Gold Card). Of course, since MuscleTech upgraded its formula, jugs of the old formula have been on sale. I've purchased the 7-lb jugs of the old CELL-TECH for as little as $20.
Another good creatine product is EAS' Phosphagen HP, the first one I used for loading. I think you can get a 4-lb jug for about $25 (maybe less, depending on where you shop).
Whatever choice you make, used with a good diet and training, you should be able to pack on some good size.
Good Luck.