Jiffy makes a 72 cell tray with hexagonal cells (I think it's called Pro-Hex), the shape is supposed to help the roots not get as compacted as opposed to square/circular cells. This was my first year starting peppers from seeds but I used these trays and had a fantastic success rate. Prices online look rather steep, I got mine at Lowe's for roughly $5 a tray. One thing to note is that this tray doesn't come with a dome, so I also bought a tray the same size that had a dome and just used the dome on the Pro-Hex tray.