Not as cheap or as easy to get hold of here in the UK as in the US. Non on eBay. Ordered them from Yambits.
Those charging numbers sound OK Fawksey - and as for buying el-cheapo brushes, I think that is a mistake anyway.
You are further ahead and much LESS likely to be stranded somewhere with a dead bike by spending a few more quid and buying these small but critical parts from a reputable vendor such as YamBits. Cheap brushes will likely wear out more rapidly and may not even fit in the first place.