nanogoo,
There are no steadfast rules on the price of a site as there are a lot of determining factors. The primary one is obviously location (proximity to schools, shops etc). There are other considerations such as whether or not the site is elevated, what the views are like, what services are closeby (ESB, water etc) as well as whether or not the site has planning.
I have seen prices in Galway run from 60/70k up to a few hundred thousand.
Take a look at
[broken link removed]
as this will give you a good idea at what price you are looking at...
A site with Outline or Full Planning will be more costly than one without.
As regards obtaining a loan, I think I am correct in saying that you can get up to 75% of the cost of the site but this is only on a site for which planning has been approved.