So I have been looking into these clear cling on type protective films, the kind you apply with some soapy water solution (then they cure overnight and are supposed to form a semi-permanent, clear coating for scratch protection). And this is what I have found so far...
There seem to be 3 main players, ZAGG/InvisibleSHIELD, BodyGuardz, and BestSkinsEver.
Apparently ZAGG were the original ones, they are supposed to be made out of the same stuff used to cover helicopter rotors during shipment or something. They are also the most expensive, $24.95 for one. And I have read mixed reviews, some people rave about them and say they are worth the money, others say they are not. The ZAGG skins come with some soap solution and a little squeegee. I couldn't see their shipping, but I get the impression it's a few dollars, although free shipping if you order more than $28 worth of stuff. They have a lifetime warranty, although you have to pay a few dollars shipping for them to send you the replacement, and then mail back your old case (in an envelope, cost = postage stamp). They also offer a customizable option, you can upload a picture and have that printed on your skin.
Then there is BodyGuards, they are $24.95 for two. They seem to be alright according to the few reviews I have read. I'm not sure if they come with solution or not. Their shipping is cheaper too, $2 for one skin or $1 for two.
Finally there is BestSkinsEver. This company was apparently formed in reaction to ZAGG. They say they use the same material. They believe in keeping prices low, in fact their skins are only $6.99 each! On their website they say that they don't believe in marketing BS, just keeping prices low, etc... In fact, they apparently mail their skins in a plain brown envelope! lol I don't remember how much shipping was, but I think it was pretty reasonable, possibly free if you order a couple skins. I think they have a lifetime warranty too. I have read a lot of reviews of people who were very happy with the product, and even more who said that service was excellent (called or emailed with a problem, and they mailed them another one no charge, etc.).
So after conducting all this research, I think I would like to go with BestSkinsEver. Only problem is, that they aren't making one for our Indulge just yet.

I have emailed them my request, we will see what happens (in fact, if you are also interested in getting one for your Indulge, please send them a message here:
contact BestSkinsEver). In fact, it turns out that BodyGuardz isn't making one yet either.

Yes, that's right, the only people making a film for the Indulge right now are ZAGG:
ZAGG Samsung Galaxy Indulge Skin
Although in order to find it on their site, I had to pull up the "Forte SCH-R915."

Although when you look at the page, it is correctly titled "Samsung Galaxy Indulge Skin" and it does look like the correct one (maybe those of you who have the phone in hand can take a closer look at the photo and tell me if you see anything out of place as far as how the cutouts, etc. look?).
So I suppose at this time I am going to go ahead and order the ZAGG skin, as it's the only option. Maybe later if it peels off, I will try BestSkinsEver, or just get a warranty ZAGG as a replacement. I will be getting the "full body maximum coverage" skin, that's supposed to cover the screen, the back, the sides, and anything else they can think of. As always, I shall report back my findings (if anyone is interested... if not, this sure has been a whole lot of typing for nothing, lol). I will then install the cheap plastic case (noted above) over the top of the ZAGG skin. We shall see how it goes...