Exactly, I'm in Australia so there is no local supply, not for the MR anyway.
Also, anything Estes is 200% to 300% markup here, so the MR if it were available here, would likely sell for around $50 - $75, no joke.
Other online might be cheaper for the kit but they generally charge for shipping.
AC supply for example charge $11.99 so on top of the $14.99 is $2 more than Estes' price with free shipping within US(to freight forwarder) Plus, reward points to use during the next sale
But yes, there are pricier alternatives that do have stock.