Hi Mark..That is expensive. The timing side roller is probably the one your dealer is talking about as 'not being made' anymore. It's not made anymore by RHP but is still available from other manufacturers.
If you have specified a 'C3' fit for the bearings that will add cost as these are now much harder to source in the Imperial sizes..
The two drive side bearings are Metric and you should be able to source them without difficulty from most bearing suppliers at a reasonable price (NF305 roller and 6205 ball bearing.) The two timing side bearings are still available as well through good bearing suppliers.
A brass caged roller is not necessary..All types listed under the relevant numbers are at least equivalents, so will operate equally well in their designed environments. In fact some of the 'plastic cage' types, due to the smaller dimensions of the cage, have an extra roller so their load bearing capacity is actually higher then the brass caged type.
'C3' bearings have slightly larger internal clearances than standard type 'CN' clearances and were specified originally by BSA. However, I have run both types without any discernable problems. Ask for 6205 C3, for example if you want this clearance. Also be sure you are being quoted for American, Japanese or European 'branded' bearings...avoid Russian, Indian or Chinese bearings unless you want them for your wheelbarrow...
Mail me off forum if you have problems getting them...Ian
email (option): ian@wright52.plus.com