I use these essential oils for beauty use, in the bath, in an oil burner, etc and they're affordable so may be worth a try. I've found Amazon is very good for finding low prices too:
lavender, geranium, bergamot, grapefruit, lime, lemongrass, ylang ylang, clary sage, patchouli and rosewood. I just had a look on Amazon and benzoin and petitgrain look pretty reasonable too even though I haven't used them. They are listed as notes in perfumes, though, so might be worth getting.
I find geranium and bergamot work well together (also with lavender) and lavender and lime are a great combination, as is lavender and ylang ylang/clary sage. Geranium is a brilliant oil to use as it's a bit rosy (also citrusy) so it's a good alternative to rose oil which is super expensive and ylang ylang, although not exactly like jasmine, has got a similar kind of exotic headiness to it but it's soooo much cheaper than jasmine.
Have a look on the net and see what other oils you can find. HTH!