hi there! we had a similar problem with our group as we were a biggish group and lived in a baby boom area (so competition for space was at a premium).

our options were:

church hall (check for draughts though and see if they have lockable space to put toys/activity stuff for when bubs get older). also these places can be a bit more exxy.

schools: some schools hire out space during the week for MGs. these are generally pretty good (the ones we inspected had kitchenettes with microwaves, fridge etc) and good play area (ie carpets and mats). pretty affordable (usually pay by term and amongst 17 ppl wouldnt be much)

community houses: this is where we ended up. the one we went with didnt have specific MG space, but we have made it our own. it had a carpet square in the middle, chairs and a kitchenette. we bought some plastic tubs with lids to stock some snacks for us mums and toys for the bubbas. (cheap as chips, in our experience). also usually these places are near a park which is great if you tee it up for a walk with the prams or for when bubbas are older and want to have a play.

ALSO: some cafes were open to bookings for MG. so if you have one that has the space maybe approach them and see if they would tee up a specific spot for you guys to meet up each week. we did this for the interim (and go back after 'formal' MG for coffee). at the end of the day they can make squidloads of cash from MG and while the babies are so tiny there is no hassle with toddlers running around everywhere).

HTH