This family got given tons of old pallets, you might be able to find some nearby and turned them into an amazing wooden floor.
Yes they had some help from friends but they would have saved a small fortune doing this + it’s a wonderful feature to any house!

Hours of nail removal later

They had a few nails (9000 in total)

Took them to a workshop to get machined (i.e. cut and straightened)

A friend with a machine would save you some more money but failing that maybe buying them a few pints down the pub would work?

The finished wooden floor panels, imagine how much that would cost from a DIY store!

The laying of the floor begins!

Even with a little help from a small friend

Half of the flooring done.

Sanded, glossed and finished!
Source: http://imgur.com/a/I3JyV