Basting sprays are pricey but remember, you don't need to soak the fabric to get it to stick.
I think I like Sulky best, but Dritz is good, too. You can lessen the cost by using the 40% coupons JoAnns sends in their mailer. These coupons are often in the local newspaper, too. I have friends who don't sew, but save the coupons for me. I use that coupon for the most expensive item I'm buying when at JoAnns.
one other tip: JoAnns sells a magazine called Fashion Fusion at least once a year. It costs $2.99, but the back cover has six coupons worth 50%, 40%, and 30%. It's usually quietly displayed somewhere near the cutting area. I usually buy several copies when it comes out and keep them in my car. I rarely get out of that store for less than $40 or $50, so that $2.99 saves me a lot of $$. As for toxicity, read the whole label. I have sinus related allergies and have a lot more problems with other peoples' perfumes than my basting spray.