You can get a starter set of oils that contain 10 colors in 12 ml tubes for about 6 bucks with the 40% off coupon at Hobby Lobby... I'd imagine that Michael's has something similar... Hobby Lobby has the 40% coupon come up about every two-three weeks, even more often as the holidays approach.
Just make sure that the set contains Yellow Ochre, Burnt Umber, White, and Black, at a minumum... 12 ml tubes will last years, so the 21ml and up sizes aren't needed for weathering... When you decide to do figures, the flesh colors can be mixed, including the pink shades for the lips, from that same set, since you'll also have crimson and red and you won't need to drop yet MORE money for another type of paint..
You'll need the white for the pink shades, and black will always be needed, regardless.. You may not find much use for the blue and ultramarine yet, but eventually, it'll happen (especially if you start shading Luftwaffe Feld Blau)... The yellow will alwas be needed if you do any shades of blonde hair, as will the black, Burnt Umber, etc..
I've had the same set for about three years and have used every color in it, plus mixed a dozen more... They're an excellent value, and once you get past the initial "But it's for ARTISTS!" -reaction, it'll all make sense and you can stop recoiling in horror, lol..
Keep in mind that you'll need a clear flat too, since they dry semi-gloss...