MG_MR2 you are doing a great thing of thinking of others and trying to help out. Commendable.
Point is reiterated to ensure enthusiasts and you are aware of buying channels to gain their own pricing and what shipping costs are. The suppliers referred for some of the parts are questionable if that's the best channel/cheapest seller for the same part.
The thread is not being transparent (posting) on exact final costs (delivered to their door) and their saving. Personally I have been part of group buys many many years ago only to find out in the end the organiser is doing it to have there parts / shipping paid for by the group and purchased through a USA supplier that was more expensive than others; few people got burnt so to say.
MyUS shipments from USA in the last month, including insurance, standard shipping total weight at 7.4lbs at $58usd, 11.4lbs for express/overnight $131.06usd. eBay global shipping from USA 13lbs at $35usd. Amayama from UAE $59.07aud (box of a over a dozen bearings, syncros, seals).