From: Fatleader on
I have found an HP-22 calculator on MercadoLibre (Mexico's own eBay).
I am not the owner of the item, and I do not know the reliability of
the seller, even though he has pretty high ratings according to
various comments. It is stated by the seller that the calculator is in
fully working condition other than the following keys: 4,5,1,2,0, .
(decimal point) . It is stated that the calculator should be in fully
working condition after the cleaning of the keys. Other than those,
everything should be working fine. As well, it is going for quite a
cheap price of around 28 US dollars.

The following is the link to the item, if anybody is interested.

http://articulo.mercadolibre.com.mx/MLM-47345039-calculadora-hp-clasica-de-los-60s-funcionando-_JM

You can contact me at cuchilloho(a)gmail.com if you need any help with
the language.