I'm just at the beginning, but with a machine needing 30 min rendering out 1 sec of a simple particle system animation I'd see already myself spending hours waiting instead of experimenting and creating.

A new PC will be better but never fast enough with my budget, so instead of investing now for being anyway slow I'm checking the farm options to be used at need with small progressive investments but fast final results.
Searching a bit this is the list I got with Houdini / Mantra support and the cost for 250 frames of my animation (Particles Fun tutorial)

Amazon EC2 no more supported (?)
https://www.prorender.de/renderservice-renderserver-rendermodul-renderfarm-online-miete.html [www.prorender.de] Germany, i7 6800k €2.1
https://animarender.com [animarender.com] Russia, $2.83, any number of server
http://fox.robust.my/ [fox.robust.my] Malaysia, $3.83
https://www.zyncrender.com/ [www.zyncrender.com] USA and Asia Google cloud, $5 for preemptible 8 core virtual machine, only Houdini FX e Indie (?)
http://www.myrenderbox.com/ [www.myrenderbox.com] Canada, $7 with Diamond render no waiting
http://www.gridmarkets.com [www.gridmarkets.com] USA, appear to be the most expensive $7.5 (?)

A couple of questions:
Packing the project it come out 13GB, composed 99% from .bgeo files. Will I need to upload it all the times for every project
Does someone have experience about previous farms, or can suggest others.

This is the only lonely question from answers/suggestions, I am seeing.

Hoping you would found your answer at this point of reply time

http://www.sidefx.com/docs/houdini/render/cloudfarm.html#rendering-on-cloud [www.sidefx.com]

@nagapavan in fact after experimenting with Houdini and the renders I understood was impossible for me having the time to learning by doing, too slow to obtain any result with my resources.
So shifted my interest to realtime engine, now after one year Unreal Engine release the beta of his new fx tool Niagara, hopefully I will be able to experiment using a node-like approach but with realtime results.
https://youtu.be/mk3MJOqxT3g [youtu.be]

Are there any other cloud rendering services available (in addition to those mentioned at the top)?