Petco bendable bridges are perfect for Syrians!They're cheap for how big they are,and make a perfect but easy to check on hiding spot,and can be bent into various shapes as well.
Clay/terracotta pots are also great,but some hamsters might make them roll around by burrowing underneath which could be a problem.I haven't had an issue with a Kaytee tunnel made of the same material I found,but I will say the medium size of it is only good for small Syrians or young Syrians.For the investment,you'd be better off getting the largest size.This can't be found in most pet shops though,and I've only seen them in Petsupermarket
If you can find a mug or tealight holder that is large enough for a Syrian,those are great too!Reptile sections can be a good area to check in pet stores,especially with things like half logs and resin hideouts.Be careful to only get wood items that are safe wood of course,but do keep an eye out for anything useful and keep an open mind!