This wonderful to me, I am working on a miniature Victorian kitchen and the photos are a great help. I do not think I can find an Aga of that type though. It would cost too much to replicate. I already have a modern one [in miniature] but it does not quite fit in. The pots & pans, the bottles and such, great resource.
Perhaps you are looking for the wrong thing? There are lots of miniature kitchen
ranges and many of them are not expensive - the aga was invented in 1929 and is a relatively modern appliance and in miniature terms might be quite pricey. They wouldn't have had an aga in a Victorian kitchen - but of course it looks better in a headline. As in the picture, Victorian kitchen ranges would have been placed within a fireplace so the smoke would be sent up the chimney, and I've seen some miniature Victorian ranges sold with the fireplace surround, all in one piece - they're not uncommon and can be reasonably priced.
I volunteer in the National Trust Carlyle's House in Chelsea, where there is a splendid example of a kitchen range of about 1850 - it has an integral boiler, an open fire section and a closed oven bit - very high tech for the times but the thought of actually cooking on it is a nightmare. Quite a few people however have commented that their grandmothers had had those sorts of devices when they were children - not all of them aged grannies themselves, either!