I understand you're looking for Mac OS X 10.6 Snow Leopard (32-bit), but I need to provide some important guidance:
Since Apple no longer sells physical DVDs, the most reliable way to find the ISO is through community-maintained preservation sites: Internet Archive (Archive.org) Mac Os X 10.6 Snow Leopard 32 Bit Iso Download
Processor Support: It is the final version compatible with early Intel Macs using Core Solo and Core Duo (32-bit) processors. I understand you're looking for Mac OS X 10
Macintosh Repository: Great for specific versions and server editions. Buy a genuine retail DVD from a marketplace
There is no official "32-bit only" version of Snow Leopard. Every retail copy of Mac OS X 10.6 (Build 10A432) contains both kernels. When you boot the installer: