I have lots of different silk plants that I bought from a large garden centre. I have 3 or 4 in the viv at a time, but I swap them over occasionally to keep the viv decor varied. Alice seems to enjoy re-exploring the same areas with the new plants.
I'm fortunate in that the garden centres I use are quite cheap for silk plants, but I understand some places are quite expensive.
I bought 4 of the 65mm ones for £3.40 + 70p postage which I thought was quite good. But I recently posted in another thread about a very similar vent being sold in places like B7Q and Homebase. There sold as soffit vents and come in 2 or 3 sizes too.
garden centres are cheaper for fake plants rather and i like Kehhlyr did a thread about which live plants are ok to use if you hit the 'search' on the top right
cornsnakes, ratsnakes, bullsnakes, boas and day geckos
I got a pack of 16 suckers from Sainsburys for £1. They had a plastic hook in each one but it came out easily and left a good hole for the plants and came with 3 different sizes in the pack.
Mine is an average exo-terra one looks like canabis plant! Lol it has a hook which you can bend into any shape for anything to grip. Mines wedged in behind the background and the gap filled with kitchen roll. Got them for 30p. Lol!!