I started getting tomatoes off our tomato plant in early April and haven't had to buy tomatoes since! Unfortunately we're nearing the end of them so I think I'll have to actually *buy* some this weekend :(
I pulled the plant up about 6 weeks ago and stored the tomatoes in a styrofoam box in the shed / under the house. They've lasted really well - I've just been grabbing about 1/2 kg out at a time. We've gotten 3kg off since I stored them!
I wish I'd kept track of how much we were getting off it prior to them but I only started keeping a garden diary about 6 weeks ago. I posted on 15th April that we'd had 1kg off at that point, and we were getting roughly 1/2 kg every week, so a rough guess would be 6 or 7 kg of beautiful fresh Roma tomatoes from 1 bush! Not bad at all I don't think! What's the current price for Roma tomatoes in the shop??!
Pretty soon we'll be able to start eating from the garden again - I have some peas fattening up on the pea plant, and the bok choy is growing well. Another couple of weeks I think. I'll take a photo later today if I don't get blown away :)