Amazon has Chemical Guys TVD_107 V.R.P. Vinyl, Rubber, and Plastic Super Shine Dressing (1 Gal) on sale for $22.75 when you 'clip' the 20% off coupon and check out via Subscribe & Save (select 'skip immediate delivery and just add subscription'). Shipping is Free.
Note: You may cancel your Subscribe & Save subscription anytime after your order ships. Coupons appears to be one time use.
-Multi-surface shield for both interior and exterior surfaces
-100 percent dry-to-the-touch
-Restore and maintain shine
-Works great on leather, vinyl, plastic, rubber and tires
-Repels water, dirt, dust and protects surfaces from damaging UV rays
Edit: If you are looking for a sprayable dressing, Silk Shine is available by the gallon for the same price:
Note: You can only buy one or the other as they use the same coupon.