When I don't have enough home-made compost, I use a mix of peat moss, manure and mushroom compost, all readily available and fairly cheap in big bags at Home Depot, Lowe's, etc. Here's a link to info about the mushroom compost:
http://www.mushroomcompost.com/
I fill plant holes with a mix of 1/2 of the original soil from the hole and 1/2 of the above - sometimes I use a little more mushroom compost in that 1/2. I also use the manure and mushroom compost as a top dressing, but mix it with a little garden soil (from a bag, not from my clay-heavy garden).
I would go ahead and plant them now.