Try using google first : search for cheap holidays to Salou
or you could try
[Only Registered Users Can See Links. Click Here To Register] or
[Only Registered Users Can See Links. Click Here To Register]
there is loads of deals via the web just takes a bit of routing around to get the best deals and you'll soon get the hang of it.... offcourse it all depends on the dates of travel or age of bairn (remember if under 2 then there is normally no charge for seat)
for example a quick search on google turned up this :
[Only Registered Users Can See Links. Click Here To Register]
not saying it's the best prices but gives you an idea (3 folks for a week s/c will be £289 pp inc flights)