The thing with the expense of woven wraps (like storches, didymos, girasols etc) is that they are purpose woven for babywearing. Some use organic cottons, which adds to the expense, and because they are not manufactured in massive quantities like general purpose fabrics, the unit cost is higher.

A woven wrap will be much more supportive in the long term than a jersey/stretch wrap as it has less 'bounce' or give in the fabric (jersey is a stretch fabric as it is a knit rather than a weave), and will be a lot more comfortable than a wrap made from a general purpose fabric because there is less rigidity in the weave and in the fibre.

If you are interested in woven wraps, check out thebabywearer - with the way the US dollar is at the moment really good bargains can be found on their FSOT board (for sale or trade), but it is also a great source of information on types of wraps and what fabrics are good for DIYs.