to me, it does not change subject.
a fair price to pay for a guinea.. like 4 or 5 american bucks. for a new keet... like a day old where stores sell.. hmm, for a 8-9 month, maybe 5-6 bucks is reasonable i guess. why does it have to be 8-9 months old for?
if people like them want to give away like certain breeds in a group like that, they should be giving them out for a deal together, a better price than per each bird. 100 bucks for 4 guineas is very unreasonable. it sounds like a gimic for your money. you can get like 86 other guineas that are younger for that price. If you want to lose money like that, it's your choice still... but I suggest you don't be paying 100 dollars to have 4 guineas.