To be honest if all you want to do is print trials, it'd be cheaper to print them at your school (recharge your print credit) or at the local library etc. Laser printers are fairly expensive and with ink + paper, the cost goes up quite rapidly. It's much cheaper to use a public printer where it's like 5 cents per page. So a trial exam is usually about 25 pages maximum (usually less if you're not printing out coversheets, 'this page is blank', data sheets and irrelevant detailed studies) so that'd be about $1.25 per trial. So you could print out 80 trials (2000 pages!) for $100, but you probably won't find a good laser printer and all that paper and ink for $100.
Just something to think about.
Edit: Other than that, I have a Lexmark printer at home. It's pretty good.
Though I do tend to print at school though because it prints out faster and with better ink quality (and again no need to worry about having to buy more paper and ink).