Thrift/$2 shops; often have cheap and good superhero products.

Contact is great for covering furniture!!
Print out pictures and laminate them for the walls (also add a magnet to little pics and add to fridge)
A couple of pics and then just colour co-ordinate the rest

Depending on what kind of items you are looking for maybe try some superhero material over some canvases to hang. Iron on patches work a treat on many items and also book contact. Just a couple of ideas there. I hope it all works out, good luck xx

try the wall sticker sites are heaps on facebook etsy and ebay

I would check out ebay, you can find everything there

ebay

I made this for my sons room, including a spiderman, flash, batman. They turned out great. (My dad helped a fair bit with is shed of tools). Otherwise you could simply print out some pictures and put them in a frame. Or there are great wall stickers check out ebay. Just do a goggle search for superman room decor and hepas of ideas will come up.

Ebay seems to have everything, if not a google search might come up with some…

ebay, gumtree, lincraft, spot light and kmart.

ebay will have it all at good prices

There is nothing wrong with paper decorations, a nice bedspread and maybe a franchise rug, more often than not they change their minds quickly anyway!

there are some good comments here

I second the removable wall stickers. They are very affordable and really effective. You can even find them on ebay but if you’re after certain types I would google what you are after.

I used removable wall stickers. I bought them from a discount store for $2 for 10 large stickers.

http://Www.boomroom.com.au you can make any wall paper you want

You can Buy the felt from spotlight and the pop up tubs & the cube storage from kmart

ebay and etsy. Two fantastic websites with lots of options.
Keep an eye out for toy/manchester sales too.

bigbadtoystore.com ? My almost 4 yr old is I love with transformers, they had some cheaper than eBay stuff on there, maybe have a look there?

Ebay all the way!

Have you tried online stores such as deals direct, they often have great deals also subscribe to sites like mum go as they also have licensed character stuff all the time!