The M1991A1 is about the cheapest Colt 1911 out there. I paid around $600 for it last year.
(after getting laid off from work and having to sell my "nice" guns, this was my gift to myself when things turned the corner)
Colt Custom Shop charges $350 for a Royal Blue refin.
Cheapest way to get it to them is thru your local FFL.
For the refin charge they did replace the plastic trigger and mainspring housing, which was kind of nice of them.