Best place to get fairing lowers?

Hi everyone,

I have a naked K4 in yellow and want to trade it in for an S in yellow. I've seen a couple advertised with and without lowers, the ones with seem a few hundred more and just wondering where the best place to get some lowers from if I buy one without? Can I fit them myself or best done by a garage?

BTW how much do you think I should be looking for for a K4 on an 05 plate with onl 1600 miles on the clock? Very good condition, only a slight scratch on the end can which was there when I bought it off the dealer (I got a fair bit off the price). Apart from that totally standard and perfect.

Many thanks for any replies,
Matt