HRC sells JE pistons for 447.00 Part #H EC-4000. I'm not sure if their the cheapest but that's a decent price. Don't buy the rods there, you can get better prices.
Just my opinion- don't buy the 10.5 JE's from Howell. They're not designed by JE, they're built to Howell's specs by JE. They don't have the oiling holes the 8.8's do, and it's very possible you could have clearance issues.
Look into Arias or Wiseco 10.5's they may be cheaper than JE. Altho both companies "custom" make them, they often have a shorter turnaround/backlog than JE.
i got mine at www.raceengineering.com they have really good prices and keep them in stock. www.TeamKLR.com 1997 Silver RS 12.3@118mph,20psi, race gas(drag radials) Wiseco 10.5 Pistons Eagle Rods T3/T4 Turbo Custom FMIC Greddy Exhaust 440's