Regarding bumping ads in the classifed forums, we've just installed a new (customized) add-on that will change the way ads are bumped to the top. Please refer to the post "Bumping Classifed Ads" for details.
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Not that I'm aware of and I've been (half heartedly) looking for decals for a long time. Almost the decals apart from the New World script and "Schwinn Seamless Tubing" can be found on Superiors and Paramounts, which show up occasionally.