You might consider the following:

https://www.thermofisher.com/antibody/product/Goat-anti-Human-IgE-Secondary-Antibody-Polyclonal/A18793

http://www.abcam.com/goat-human-ige-hl-hrp-ab73901.html

http://www.sigmaaldrich.com/catalog/product/sigma/a9667?lang=de®ion=DE

https://www.novusbio.com/products/ige-antibody_nb7459

http://www.agrisera.com/en/artiklar/goat-anti-human-ige-heavy-epsilon-chain-hrp-conjugated-.html

https://www.lsbio.com/antibodies/goat-anti-human-ige-secondary-antibody-ihc-wb-western-ip-flow-elisa-ls-c315485/325669

Thank you so much Michael !! Have you tried any of these in your experiments ? 

No, but you can assume that nearly all of them will work. Anyway, you should always run a positive control to be on the safe side. Then you will recognize immediately if one of the reagents degraded.

Very true. Again, thank you so much ! 

In addition to Michael's excellent suggestions, here are a few more sources for HRP conjugated, anti-IgE you may want to explore: https://www.linscottsdirectory.com/antibodies?q=IgE&mode=specificity&host_species=&reactive_species=Human%2CHomo+sapiens&applications=&format=peroxidase+%28HRP

Yes, Linscott's Directory is a well-known and proven database to identify antibody sources.

Thank you so much Russell, that will help a lot ! I'll remember this database for next time.