|Though not transcribed, you can find|
PA Wills in this Probate Records collection.
I know that manually flipping through hundreds of images may seen impossibly time consuming but often, you can narrow it down by date or name and sometimes, there are scanned indices. For example, the Pachino records in the Siracusa collection where I found my ancestors have a separate "Indice" book. Also, in the Pennsylvania Probate Records, sometimes there is a direct Will Index but in other counties, you need to first look in the Estate Index, which will point you to where you can find the right reference in the Proceedings Index, which will then finally tell you what volume and page in the Will Books you're looking for.
Also noteworthy is the fact that FamilySearch.org have thousands more records available on microfilm which haven't been digitally scanned yet. These can be found and ordered from the Catalog section and the microfilm will be delivered to your nearest Family History Center. Just pop in the location you're searching within and see what microfilm collections they have available.