Toshiba Tecra 550 CDT ram upgrade

Most people just wouldn't understad, but for it's time this laptop rocks! It is a 266 pentium 1. I'm looking for a trustworthy site besides ebay that has a ram chip of 128 plus, preferably 160 mb. 160mb is it's maximum memory, and though it is old, i know i can find that chip. Problem is i dont shop online enough to know all the good sellers.
Can someone give me a hand to upgrade this dinasour? It may seem silly to upgrade somthing so old but hey, i want to
any help, would help