Where can i buy a reasonable priced bed and mattress for my FDW?

Not sure what is your budget. You can consider this shop: http://www.fortytwo.sg/mattress/shop-by-size/super-single.html?dir=asc&order=price You can get a single size foam mattress from $69. and a frame from Ikea from $39 on. http://www.ikea.com/sg/en/catalog/categories/departments/bedroom/16285/?sorting=price