I'm in a similar position - looking for Oilite bushes in the UK for a Rockcliffe (but still in the planning stage).

If the Ondrives web site prices are typical I suspect that I will be going with linear bearings from Marchantdice - they are pretty much the same price and I'm sure they will be a lot smoother running.

But if you do find a cheap(er) online supplier please do post it

Mark