Depending on how much you want to spend, you might want to find a Phototherm (Photo-therm) on ebay. If the item includes a 4x5 reel (which holds four 4x5 films), so much the better. Otherwise you could by a 4x5 reel directly from Phototherm.
A Phototherm is a much higher quality piece of equipment that a CP-series Jobo, is more automated, and is easier to use. The down side is that Phototherms are somewhat less flexible in the development programs you can run. This is a consequence of the fact that Photo-therms are automated, but the CP-series Jobos are not.
Auction prices for Phototherms range widely. I have two. One cost me ~$75. The other was ~$300 as I recall. Sometimes they sell for well over $1000.
There are three basic series. The oldest is FP-1. The next is Sidekick. The most recent is Super Sidekick. The mainframes come in two sizes. One can handle tanks that hold up to four rolls of 35mm (or 4 sheets of 4x5). The other can handle tanks that hold up to eight rolls of 35mm. Although I can't swear to it, I think the 8-roll phototherms would also handle up to 8 sheets of 4x5 film. All the Photo-therms are table-top units.