None that directly give that feat, no.
Arms & Equipment Guide, a 3.0 book, suggested that a bonus feat should be worth approximately 10,000 gp in item form. This suggestion was not repeated in 3.5, even in the (sort of) 3.5 analogue to AE&G, Magic Item Compendium, and most DMs won’t go for it most of the time. Still, perhaps worth asking.
Other than that, what you’re looking at are shenanigans for extra feats or for rearranging your feats. Psychic reformation can swap any feat for another you qualify for, which means that you could take Verminfriend, and then after you have taken the 1st level of arachnomancer, swap it to something you actually want. Worshiping elder evils, the dark chaos feat shuffle, and myriad other ways of cheesing extra feats also exist.
Note that neither of these get you out of taking Verminfriend in the first place, which means you still need to meet its prerequisite: being a drow. Since drow have LA +2, they are quite poor, but consider the half-drow from Races of Faerûn or lesser drow from Player’s Guide to Faerûn or this web article, which count as drow without the LA. Otherwise you could use alter self to turn into a drow, use psychic reformation to swap a feat for Verminfriend, and then use psychic reformation again later to swap it back to what you actually want.
But anyway, those kinds of shenanigans are rarely accepted at actual game tables. Rather you should talk to your DM about possibly waiving the Verminfriend requirement altogether: it’s not as though arachnomancer is a high-power prestige class in need of taxes to balance it out.
Alternatively, you might consider trying to get your DM to allow you to be my homebrew swarm druid, which gets a class feature that counts as Verminfriend for prerequisites. That way you avoid having to take the feat.