autozone will let you down, advanced auto has the best selection of vac line parts you'll find any where this side of the internet. i dont have o'reilly's but i hear they got a good selection too.
that pooling in the lim is not necessarily an emergency, its coolant seeping past the bolt threads. from what i can see in the pics you seem to have a black gasket between the head and lim. meaning its plastic and should be replaced. when you do change the gaskets you want to clean the bolts good of all old sealant, and apply new thread sealant when you install the lim again.
