Hi and welcome Hilly,
It's always dangerous to give advice as tastes vary, opinions vary, needs vary and things go wrong!?
You also need to decide whether piano accordion or chromatic button accordion.
However, my suggestion would be a used, Italian made*, three or four voice piano accordion 41/120 in good working and acceptable aesthetic condition. Preferably with straps and carry case included. I do recommend trying before buying. Some vendors allow say up to a month's rental before commitment to purchase, with the rental fully included in the purchase price. ?
There seem to be several sources of used accordions in your general locality listed on Google : check them out! ?
(*Actually made in Italy, not just with an Italian sounding name but made elsewhere, eg China)