Oz Art Gallery on Nepean Highway in Frankston has been around for a long time. You'll find it on the left-hand side of the road as you drive toward Seaford from Frankston. Turn left at the Boathouse Restaurant sign, as that's where the parking is. There is ample parking and it's a good place to shop.
The gallery is an old converted heritage house. It's small but it packs a lot in it. It has a lot of various sizes of landscapes of the area (if you're looking for anything related to the ocean/sea, this is a really great place to find it). Then there are some local and northern territories for indigenous art. As well as an eclectic mix of contemporary art. You will also find various homewares, cards by local artists and other household accessories and gifts.
They do lay buy and also take pay pass and credit card.