Propylene glycol is a cost effective choice for orals. Add a slight amount of BA (to act as a preservative) and you're set. 1% BA is more than adequate.
Polysorbate 80 is also great to add to some solutions. Particularly hard to suspend compounds such as winstrol/anavar/nolvadex. Add a couple percent PS80 to the total solution and it just really holds it all together well.