A good, straight-edged metal spatula can be very useful to the cast iron cook, especially for planing off crusty uneven spots which can form in an established seasoning surface. The benchmark brand seems to be the Dexter-Russell, but they can be a bit pricey. Saw this utensil line at Walmart over the weekend and picked one up. Didn't seem like I could go wrong for under $6.
http://www.walmart.com/browse/home/the-pioneer-woman-kitchen-tools/4044_1225301_1231327_1231604
The one I bought is apparently a Walmart exclusive:
http://www.walmart.com/ip/Pioneer-Woman-Rosewood-Handle-Jumbo-Turner/46429861
Nice, wide leading edge, and rounded corners to lessen the chance of gouging your seasoning.
http://www.walmart.com/browse/home/the-pioneer-woman-kitchen-tools/4044_1225301_1231327_1231604
The one I bought is apparently a Walmart exclusive:
http://www.walmart.com/ip/Pioneer-Woman-Rosewood-Handle-Jumbo-Turner/46429861
Nice, wide leading edge, and rounded corners to lessen the chance of gouging your seasoning.