I have used them before and have been able to go for about 5 weeks gradually building up a pack of bits and bobs which made the postage not uneconomic. There is not another seller on ebay, that I know, that allows this.
I have spoken to them by phone recently and they have been banned from international selling due to one person in UK complaining to Fleabay about the postage. A bit unfair really as the seller does post in the description how much the shipping is. So if a person bids and then complains it shows that either the person was trying to try a flanker or that they did not bother to read the postage cost in the first place.
Anyway they will, at some time in the future, be back to selling to UK but in the interim they have sent the message out for buyers to send in their wishes for spares directly to the company rather than waiting for when Fleabay lifts the ban.