It all depends on your budget and your capacity to learn.
If you really just want painted models to play with, you have two choices.
CHEAP - Paint them incredibly simply (2/3 colours, then dip them)
EXPENSIVE - Pay someone to paint them on commission for you
You can easily paint nicely done miniatures by buying a can of coloured spray primer, spraying them your main colour - getting a pot of silver paint for all the weapons, doing all them (rough is fine) - getting another colour for cloaks/cloth/whatever. Once they are done, it will be a blocky mess, but then you dip them in something like armypainter strongtone - it will give them huge depth, and make them look surprisingly good for the effort.
You could paint an entire army in a weekend like that, I'm certain.
The alternative is commissions, which will range from $5-$20 per miniature (it depends so much on your area, and what kind of detail you want). For an army of 100 dudes, that obviously adds up.
You can buy already painted armies DIRT CHEAP off ebay (or the forums here), because for some reason no-one likes pre-painted models.
Finally, you could learn to paint - it is incredibly rewarding (and frustrating). I don't have time for it either, but I don't play so I don't care. It is quite relaxing after a while, but you won't be able to force yourself to do it.
If you want to paint them yourself - THIS is the subforum for you.
If you want to buy some already painted cheap - Have a look at this one ->
http://www.dakkadakka.com/dakkaforum/forums/show/11.page
If you want to get a commission painter to paint them for you - have a look through here and find a Canadian painter ->
http://www.dakkadakka.com/dakkaforum/forums/show/73.page
I you do decide to get a commission painter, google their name - there are a surprisingly large amount of grubs that either do a terrible job or just steal models, and most of them are listed here in various forums.