I want to experiment it in my house or office. I think it would be of great fun to see the transition in real life.
Gadolinium (Curie temperature - 292K (http://en.wikipedia.org/wiki/Curie_temperature)), price: about 100 USD for 10g (http://www.sigmaaldrich.com/materials-science/material-science-products.html?TablePage=19297763 ), about 17 USD for 1.5 g at ebay (http://www.ebay.com/itm/GADOLINIUM-METAL-99-95-1-5g-in-ampoule-under-argon-/120173806351 ). Please research safety issues thoroughly (http://www.sigmaaldrich.com/catalog/product/aldrich/263087?lang=en®ion=US)
Gadolinium is one candidate, and its $T_c$ is about 292 K.
Ref: Nigh, H. E., Legvold, S., & Spedding, F. H. (1963). Magnetization and electrical resistivity of gadolinium single crystals. Physical Review, 132(3), 1092.