Almost $20.00 at the dealer and they are in a different town. The only good thing is I get to look at all the new tractors. The filter is a pain to get off without removing the loader.
Messick's has them for $18 and they will ship to your door. For me no more often then I have to change the filter I don't take a chance with another brand. Here is a cross reference chart online. The AC Delco PF13 is $4.97 at Walmart.
Using a Wix 51348 on my TC34DA. Same filter would fit your TC30 also. Less than $4.00 each from Rockauto when purchased by the dozen. Filter also fits my Kohler Command engine and one of my Ford vehicles. Never an issue with any of the above.