NEW YORK (MarketWatch) — The wait for McDonald’s’ special Big Mac sauce is finally over—sort of.

McDonald’s Corp. MCD, -1.03% is offering a limited supply of its famed Big Mac sauce, a move that some diehard fans have likely been waiting for since the burger’s debut in 1967. There’s just two catches: it can only be bought in little 25ml containers at 950 locations, and those locations are all in Australia.

This limited offering of 600 small tubs per store for 50 cents a piece will run through February. McDonald’s spokesmen did not respond to requests for comment or to questions about whether the offer could be extended to other countries or even to grocery stores.

The fast-food chain, struggling of late with minimum wage debates, a CEO change and dismal earnings, is also auctioning off a 500ml bottle of the sauce on eBay EBAY, -0.06% , but again, that is only open to those in Australia. The highest bid for the coveted bottle was at AU $23,100 as of Monday morning. Proceeds will go to help the Ronald McDonald House Charities.

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The 500ml bottle is No. 1 of 200 being produced worldwide.