Are there any SSD drives not from Apple for which you can enable TRIM without hacking OS X's kernel?
Enabling TRIM on third party SSDs
You can enable TRIM on third party SSDs by using a tool called Trim Enabler  which &quot;works by patching a kernel extension, and also includes some SMART data to check the health of the SSD drive&quot;. [1]
I don't know if buying similar drive will get you TRIM to be auto-enabled in Lion. User @kukoo reports that he has bought an OEM-SSD which auto-enabled TRIM in Lion after installation. [2]
According to user @bmike, Apple usually uses custom firmware . [3]
Is enabling TRIM necessary?
User @cksum has covered this as a part of his answer to a post &quot;Optimize MacBook Pro for internal SSD+HDD drives&quot;.