Practice Resources for Israel in Egypt
Choraline supply practice files on CD or as MP3 downloads. CDs are £13.99 and MP3s £8.99.
The link for Israel in Egypt for online orders is: https://www.choraline.com/store/choraline-rehearsal-cds-and-mp3-files/handel-israel-in-egypt#.W3a04_ZFyUk For phone orders call 01285 644845. For a 10% discount, the discount code is Leatherhead
Free MP3 practice files are available from Choralia at: http://www.choralia.net/hn15mp3/hn15mp3en.htm
A more expensive, but arguably better, option, is the Carus app from https://www.carus-verlag.com/en/digital-media/carus-music-the-choir-app/
If you want a recording of a performance to listen to, try: https://www.prestoclassical.co.uk/classical/products/7976795--handel-israel-in-egypt-hwv54 which is available on CD or as a download. There are a lot more recordings available just as a download. Other retailers are available.
Practice Resources for Mons
Here are some new practice files for Elegy, An die Freude (Ode to Joy) and the Haydn Dona Nobis Pacem: