I’d be a bit cautious if the plastic around those UV bulbs is already changing color - it could be the lamp is overheating, or the plastic is not up to the task or both.
I’ve been a VERY happy user of Dry 'n Store’s Global II unit (currently priced at $107) - which I’ve been using for about 10 years now? You can find these at the website: http://dryandstore.com/global-II.cfm along with other products they sell.
For travel, I’m real happy with the Widex Dry-Go UV Electric Drying Station, which I bought at Amazon.com. They run $114-160 (not sure what explains the price difference!). I used to travel with the Zephyr, but this Widex unit is about 1/3 the size. It plugs in, and the cord does run a bit short, tho.
I definitely feel that a UV + gentle heat dryer is the way to go. You get sanitization plus actual drying, both of which are good for a range of climates. They keep the aids clean and therefore our ears healthy.