Rotten column base

I had hoped to just post when we were done with this project, but things don't always work as you've planned. We've been stripping about 1/4" thick paint off our front porch all summer long. We have 1/2 of 1 large column left and about 85% of a porch post left. We've discovered that the base of the large column is very, very rotten. We need to replace just the base of the column, but we can't find any column bases that match the one on other side of the porch. Can anyone recommend a good source for column bases. We're considering replacing both of them if we have to, in order to get them to match. We'd also consider replacing them with something other than wood (provided that it's paintable) in order to avoid replacing them again down the line. Please comment with suggestions on mail order/website/anywhere in the DC area that we can go, etc. We have already tried Lowes, Home Depot, the Nonprofit Building Supply in town, and the architectural antique store in town- Edwards and Edwards, with no luck. The column is a traditional round porch column, 10" in diameter. Thanks!